Stamp-mill.



H. GAWLEY.

STAMP MILL.

APPLICATION FILED OCT. 13. I915- Patented Oct. 17,1916.

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UNITED" STATES PATENT. OFFICE.

HECTOR GAWLEY. OF TACOMA, WASHINGTON.

STAMP-MILL.

reciprocated and at the same time rotated whereby its crushing face isrelatively changed to the anvil so as to cause all parts to wearuniformly.

The invention consists of a cam of circular form, an arm attachedto thestem of the pestle and arranged to travel upon the cam to impart alifting of the pestle to. the predetermined height, such arm beingsuddenly released to admit of the pestle falling rapidly so as todeliver a blow upon the ore or other material to be crushed.

The invention further consists of an auto- I matic feed which is adaptedto be intermittently actuated by. means of the arm arranged to travelupon the cam.

The invention furthermore consists of novel means for imparting rotationto the pestle, whereby the arm connected thereto is caused to travelupon the cam.

With these and other objects in view, my invention will be more fullydescribed, illustrated in the accompanying drawings, and thenspecifically pointed out in the claims which are attached to and form apart of this application.

In the drawings: Figure 1 is a view in elevation of a stamp millembodying the invention, the cam and mortar being in section; Fig. 2 isa top plan view of the mill; Fig. 3 is a side view of the upper portionof the stamp mill, showing more particularly the feed mechanism.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

A suitable framework is provided for receiving and supporting the partscomprising the mill. This framework embodies a base 1, uprights 2, across piece 3 connecting the upper ends of the uprights 2 and anintermediate cross piece 4. The mortar is mount- 7 Specification ofLetters Patent. Patentgd 0 1;, 1916. Application filed October 13; 1915.Serial No. 55,365. j

ed upon thebase 1 and comprises an anvil 5 and inclosing shells 6 and 7.The inner shell 6 pro ects to a height slightly above the upper face ofthe anvil 5 and is provided with an inwardly and downwardly inclined rim8which'serves to direct'the material to the anvil. The outer shell 7 isspaced a distance from the inner shell 6 and is provided near its lowerend with a spout 9 for carrymg off the crushed material. A screen 10 isattached at its lower end to-the upper portion of the shell 6 and thematerial, when crushed sufliciently; fine, passes through the meshes ofthe screen" 10 into the space formed between the shells 6 and 7 andpasses ofi' throughthe spout 9; The pestle 11 may consist of a pounderof any desired formation and is provided with a stem 12 which extendsvertically and is mounted in the cross pieces 3 and 4 so as to receiveboth a rotary and a reciprocating movement.

A spur gear 13 is fastened to the stem 12 and its teeth are in mesh withthe teeth of a long pinion 14 which is journaled at its ends in bearingsprovided upon the cross pieces 3 and 4. The axis of the long pinion 14is parallel with the axis of the stem 12 so that the teeth of the gearWheel 13 will mesh uniformly with the teeth of the long pinion 14 inevery adjusted position of the gear wheel. Rotary movement is impartedto the long pinion 14 and is transmitted therefrom to the pestle bymeans of the intermeshing gear .wheel 13. The long pinion 14 may bedriven from a source of power by any suitable means and, as shown, adrive shaft 15 mounted in bearings provided upon the cross bar 3 isprovided at one end with a beveled gear 16 which is in'mesh with acompanion beveled gear 17 secured to the upper end of the shaft orjournal. of the long pinion 14. A band pulley 18 secured to the driveshaft 15, is adapted to receive movement from a suitable source of powerby means of a. drive belt 19.

An arm 20 is secured to the upper portion of'the stem 12 and is providedat its free end with a roller 21 which is arranged to travel upon a cam22 which is secured to the cross piece 3 in any manner. The cam 22 is ofcircular formation and constitutes a track for the roller 21 to travelupon. One end of the cam 22 terminates abruptly and when the roller 21clears the high end of the cam, the pestle drops a distancecorresponding to the lift of the cam.

The rotation 6f the pestle imparts a corresponding rotary movement tothe arm 20 and the roller 21 riding upon: the cam- 22 causes the pestleto gradually rise preliminary to delivering the next stroke whefi'thearm 20 clears the high end of the cam 22. The weight of the pestle andthe'lift' of the cam 22 determine. the force of theblow d elivered bythe pestle when the mill is in oper o The ore or other material-tobecrushed valve 25gfor operating the same. I The connection between the;lever'] 27 and valve 25 is indicated at 28 While the leverl2 7 may bedisposed in any manner,it'is shown arranged with theend adapted to beengaged bythe roller 21 at. a point between the high I and the low ends(if the cam 22. i The roller 21, in its travel from the high end of thecam to the low end, passes over the end of subjected tothe poundingaction of the pestle Having, thus described the invention, what isclaimed as new is:

A stamp millembodyinga rotary reciprocating pestle,- ,a stationary camconcentric with the stem of the pestle an arm extending from the end ofthe pestle and having its free endadapted to ride on the cam; and afeeder comprising a spout arranged to deliver material below and intothe path of the pestle, a lever fulcrumed between its w ends adjacentthe cam andhaving one end projected under the cam-into the path of thefree end of the arm traveling thereo'ver, avalve controlling thefiowthrough the said spout, and; a connection between the said valve and thelever,

In testimony 7 whereof I affix my signature. (a, a o

V HECTOR GAVVLEY; [L. s.]

Ciifii'el of ,t'hi s iateif may be-obtained fonfive cents each, byaddressing the Commiuioner of fatent l i i A wasmn t mn. c."

